Research On Urban Water System Operating Efficiency

Economic efficiency theory is performed to identify the urban water system operating efficiency,and its intension. Method for the comprehensive evaluation of urban water system operating efficiency is discussed. The main contents of this thesis are summarized below:1.By the analysis of urban water system and efficiency, urban water system operating efficiency is defined as: realization level of urban water system function by urban water resource effective unitization. System function is realized by mass flow in it. To urban water system, the realization level of urban water system function is measured by the effective unitization level of available water resource.2.By the analysis of structure, multilevel and mass flow in urban water system, Indicator system for comprehensive evaluation of urban water system operating efficiency is discussed. Indicator in the first level is Urban water system efficiency. Indicators in the second level are:Water resource system operating efficiency, Water supply system operating efficiency, Water unitization system operating efficiency, Drainage system operating efficiency. Indicators in the third level are:Unitization ratio of surface water, Unitization ratio of underground water, Substitute ratio of non-conventional water resource, Water supply network leakage coefficient, Water comprehensive qualification rate of water supply network, Industrial circulating water utility rate, Domestic water consumption per capita, Public water consumption per capita Sewage collection rate, Sewage treatment rate, Regenerated water utility rate.3.Specifications, standardizations, legislations and theory analysis are performed to indexation convert the indicators in the third level. Values of these indicators in 2005 and polarity of these indicators are considered in the indexation formula.4.Twelve indexes are sorted by their materiality weightings, which are calculated by AHP. Sorting their materiality weighting from major to minor, the front seven indexes are: Industrial water efficiency index, Sewage treatment efficiency index, Filter water system efficiency index, Domestic water efficiency index, Public water efficiency index, Regenerated water utility efficiency index, Surface water efficiency index. Because summation of their materiality weightings is 77.63%, these seven indexes are performed to comprehensive evaluate the urban water system operating efficiency.5.These seven indexes are sorted by their relevance weightings, which are calculated by Principal Component Analysis. Sorting their relevance weighting from major to minor, they are Industrial water efficiency index, Sewage treatment efficiency index, Filter water system efficiency index, Surface water efficiency index, Regenerated water utility efficiency index, Domestic water efficiency index, Public water efficiency index.6.The normalization products of relevance weightings and materiality weightings are defined as comprehensive weightings. Sorting their comprehensive weightings from major to minor, they are Industrial water efficiency index(36.67%), Sewage treatment efficiency index(25.09%), Filter water system efficiency index(25.09%), Surface water efficiency index(9.86%), Regenerated water utility efficiency index(4.69%), Domestic water efficiency index(3.52%), Public water efficiency index(1.81%).7.To be more intuitive, the comprehensive evaluation result of urban water system operating efficiency is classified to five levels, which are Bes(t>90), good(90~75), middle(75~60), bad(60~45), worst(<45).